Fault arc frequency domain detection device

Abstract

The invention relates to a fault arc frequency domain detection device. The fault arc frequency domain detection device mainly comprises a mutual inductor, a prefilter, an A / D converter, an FFT converter, a frequency spectrum pre-processor, a feature vector constructing device and a device for relative linear analysis and trip execution of feature vectors. As transient-state high-frequency currents can be caused in a circuit while fault arcs are generated in a power utilization loop and have certain regularity, FFT conversion is carried out on high-frequency current signals, the feature vectors Fref=[f1, f2, ... fM] of the high-frequency currents on a frequency domain when the arcs are generated are further extracted for serving as reference feature vectors, same processing is carried out on linear current signals, including the linear current signals without knowing whether the arcs are generated or not in advance, at any moment, feature vectors F =[f1, f2, ... fM] of the linear current signals on the frequency domain are obtained, correlation analysis is carried out on the feature vectors and the reference feature vectors, and whether the fault arcs are generated or not is judged according to the correlation degree. The limitation and the shortcomings in arc fault detection according to time domain features are overcome.

Description

technical field [0001] The invention belongs to the technical field of fault detection, and in particular relates to a fault arc frequency domain detection device. Background technique [0002] Based on the characteristics of light, heat, sound and electromagnetic radiation during the arc fault discharge process, a fault arc detection device is commonly used at present: a corresponding sensor is installed near the arcing point to detect the heat generated when the arc occurs, electromagnetic radiation and Noise and other characteristics, when these sensors detect the fault signal, the device will think that a fault arc has occurred in the line, and use the PZM installed in 4 different positions to locate the position where the arc occurs. [0003] Chinese patent literature discloses "Arc Fault Detection and Location System and Method" (Patent No. 201310234303.5, published on October 2, 2013), "Arc Fault Protection Device" (Patent No. 200920199078.5, published on August 25, 2...

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Problems solved by technology

[0003] Chinese patent literature discloses "Arc Fault Detection and Location System and Method" (Patent No. 201310234303.5, published on October 2, 2013), "Arc Fault Protection Device" (Patent No. 200920199078.5, published on August 25, 2010) Japan), etc., because the sensors for detecting these parameters in the patented arc fault detection must be installed at the position where the arc fault occurs, which brings inconvenience to the comprehensive detection of the arc fault in the power supply line

"Arc Fault Detection and Location System and Method" is disclosed in the Chinese patent literature (Patent No. CN200910154087.7, published on April 21, 2010). When hot plugging, it will cause the arc fault detection to malfunction

[0005] From the above two methods of detecting arc faults, we can know that there are great limitations and deficiencies in detecting arc faults only by using time domain characteristics of arc light, heat, sound, electromagnetic radiation or current sudden increase and drop. , so we need a new arc fault detection scheme

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